Two people were stopped by a border patrol agent for speaking Spanish.

“Ma'am, the reason I asked you for your ID is because I came in here and I saw that you guys are speaking Spanish, which is very unheard of up here,” the agent said in a recorded video.

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The incident happened Wednesday at a gas station in Havre, Montana, and involved two U.S. citizens, KTVH-TV and The Washington Post reported.

Ana Suda, who was born in Texas and lives in Montana, said she and a friend stopped at a store to buy milk and eggs, according to the TV station.

U.S. Customs and Border Protection officials said in a statement that the agency has the authority to question individuals.

"Decisions to question individuals are based on a variety of factors for which Border Patrol agents are well trained," agency reps said, declining to answer questions, such as what amounts to reasonable suspicion.

"U.S. Customs and Border Protection agents and officers are committed to treating everyone with professionalism, dignity and respect while enforcing the laws of the United States," agency reps said.

The agency said on its website, regarding permanent and “temporary” checkpoints, that there’s a Supreme Court balancing test between the Fourth Amendment’s protections against unreasonable searches and the government’s interest in stopping illegal immigration.

The American Civil Liberties Union previously said Congress has never meaningfully scrutinized a so-called “100-mile rule,” an area from U.S. borders that the Justice Department said serves as a second tier of enforcement. The advocacy group has urged the distance to be no more than 25 miles from a border.

U.S. senators showed support for that change in 2013, but a bill never went through the House.

Suda said the incident happened in Havre, a small agricultural communitymore than 30 miles away from the Canadian border.

Suda told The Washington Post she plans to contact the ACLU to seek legal guidance.

Customs and Border Protection officials said they're reviewing the incident to ensure their policies were followed.